Modified PN code laser modulation technique for laser measurements

Xiaoli Sun; James B. Abshire

doi:10.1117/12.817254

24 February 2009 Modified PN code laser modulation technique for laser measurements

Xiaoli Sun, James B. Abshire

Proceedings Volume 7199, Free-Space Laser Communication Technologies XXI; 71990P (2009) https://doi.org/10.1117/12.817254
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

Pseudo-noise (PN) modulation techniques have been used to modulate lasers for time of flight measurements and for profiling atmospheric backscatter. Compared to mono-pulse techniques, PN code modulation allows timing and backscatter measurements to be made with much lower laser peak powers and higher duty cycles. We have developed a new modified version of PN code modulation for laser measurements in which the laser pulse width and position may also be varied within the PN code bit interval. These allow more degrees of freedom for optimizing laser measurements. We have demonstrated these in laboratory measurements using a 974 nm laser diode, return to zero (RZ) PN code modulation at various laser pulse duty cycles, and a photon counting receiver. The results show significant improvements in the receiver signal to noise ratio, sensitivity, and ranging precision for the lower duty cycle RZ PN codes.

Citation Download Citation

Xiaoli Sun and James B. Abshire "Modified PN code laser modulation technique for laser measurements", Proc. SPIE 7199, Free-Space Laser Communication Technologies XXI, 71990P (24 February 2009); https://doi.org/10.1117/12.817254

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